Here is the Parking Brake System from High Angle Driveline -
http://www.highangledriveline.com/e_brake.html
I am looking at adapting the brake to the Rockwell T221 or converting over to the Divorced 205 from a Dodge for the correct front passenger drop.
The T221 and NP205 both use the same chassis mounts. This should make it a bolt in deal if the brake wont fit on the T221. The NP205 is also alot quieter and easier to find parts for. The T221 I have is actually pretty quiet and is in great shape. I just hate to invest any money into it and not be able to get parts later.
I am also looking at installing a Spicer (Brown-Lipe) 2021 Overdrive between the SM420 and Transfercase. This will give me the overdrive I need for the freeways and the gear splitting when off road.